Q:

Which element has the largest atomic radius?

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Quick Answer

The element that has the largest atomic radius is cesium. It has an atomic radius of 298 pm, or picometers. An alkali metal, cesium is so active that it instantly explodes if dropped into cold water. It's also one of the few metals that becomes a liquid at close to room temperature. Its melting point is 83.19 degrees Fahrenheit.

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One of cesium's most important functions is as the basis for the atomic clock. Cesium is used to calculate the length of a second. This is done by beaming a signal of a certain frequency through isolated cesium atoms.

Cesium is also used as a "getter," which means that it will remove any trace of oxygen or water from a vacuum tube. It's also used in oil well drilling to clear any leftover chips of rock. Cesium has also been used to sterilize surgical equipment, food and sewage.

Cesium is a fairly rare element on earth, but it's more abundant than silver, mercury or even tin. It's most often found in pegmatite ores. One of the richest sources of this ore is in Manitoba, Canada.

The atomic number of cesium is 55. Its atomic weight is 132.90545, and its density is 1.879.

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Related Questions

  • Q:

    What is cesium chloride?

    A:

    Cesium chloride is a colorless salt made from cesium, a metal. Its formula is CsCl, and it can be radioactive or non-radioactive. Non-radioactive cesium chloride has been used experimentally as a cancer treatment in conjunction with other supplements and a special diet.

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  • Q:

    How many neutrons does cesium have?

    A:

    According to the Encyclopædia Britannica, naturally occurring cesium has 78 neutrons. Cesium only has one stable, nonradioactive isotope, cesium-133, which contains a nucleus of 55 protons and 78 neutrons. Other, less common isotopes exist with a varying amount of neutrons.

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  • Q:

    When is an element chemically active?

    A:

    An element’s chemical activity is defined as its stability relative to the elements surrounding it on the periodic table. Chemical activity is also related to electronegativity. Elements that are highly electronegative are highly reactive, while elements that have low electronegativity are less reactive.

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  • Q:

    What is an atomic radius?

    A:

    The atomic radius describes the size of the atom, and although there is no standard definition for the value, it is the distance between the nucleus and the outermost electrons. Atomic radii tend to increase moving down the periodic table, but they decrease moving left to right across the table because electrons are more tightly packed for elements that are closer to the right side.

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